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<xsl:if test="record/datafield[@tag = '245'] and record/datafield/subfield[@code = 'a']">
...
</xsl:if>

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<?xml version="1.0" encoding="utf-8" ?>
<!--
	Assumes an XML document with multiple <order> elements inside a wrapping <orders> element.
-->
<!DOCTYPE xsl:stylesheet [
	<!-- Close your eyes and take a leap of faith! -->
	<!ENTITY countAllOccurences "sum(ancestor::orders/order/orderLine[properties/productNumber = current()/following-sibling::productNumber]/@quantity)">
]>
<xsl:stylesheet
	version="1.0"

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<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet
	version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:umb="urn:umbraco.library"
	exclude-result-prefixes="umb"
>

	<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />

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<xsl:value-of select="string-length($string) - string-length(translate($string, $char, ''))" />

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function filterBy(selector) {
	var c = selector.value, loc = document.location, q = loc.search;
	q = addOrReplaceQueryStringParam(q, "category", c);
  	document.location = loc.pathname + q;
}

function gotoCategory(selector) {
	var c = selector.value;
	document.location = "/produkter?category=" + encodeURIComponent(c);
}

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<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet
	version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:umb="urn:umbraco.library"
	exclude-result-prefixes="umb"
>

	<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />

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<xsl:variable name="apos"><![CDATA[']]></xsl:variable>
<xsl:value-of select="translate(RTEFieldName, $apos, '_')" disable-output-escaping="yes" />

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<!-- Selects 'YES' if CONDITION is true() -->
<xsl:value-of select="substring('YES|NO', not(CONDITION) * 4 + 1, 3)" />

<!-- Selects 'NO' if CONDITION is true() -->
<xsl:value-of select="substring('YES|NO', boolean(CONDITION) * 4 + 1, 3)" />

<!--
Notes:

   * Need both versions because the longer value must be the first of the two

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<?xml version="1.0" encoding="utf-8"?>
<!--
	Triggered by Darren Ferguson's hilarious "The Umbraco XSLT for loop"
		(http://www.darren-ferguson.com/2011/2/22/the-umbraco-xslt-for-loop),
	and Lee Kelleher's follow-up: http://pastebin.com/92UXcYUQ,
	I thought I'd document the coolest way I've seen it done, which does not even use
	recursion... only requirement is that the source document has at least as many "nodes"
	as the loop needs.

	(If there's too few nodes this stylesheet could be modified to use itself as "counter",

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<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet
	version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:umb="urn:umbraco.library"
	exclude-result-prefixes="umb"
>

	<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />